Quickly-removable dust cap



Patented dan. 16, `1.923.

QUICKLY-REMVABLE DUST CAP.

Application filed January 11, 1921. Serial No. 436,555.

v'o elf whom. it 'muy concern.'

lle it lrnovfn that l, VViLLiaM Irrionn, a citizen of the Unitedtltates, residing at Los in `clos, in the county of Los ifingeles undStute oi California, have invented new lul linproveinonts inQuickly-ite- .'c Bust Caps, -oi which the followg a specification. y

.lt is the' object of this invention to provide u cap 'lor nipples andthe like, which 'u ill he readily removable and as readily in- "rd inposition over a` nipple. rllhe device ,Y particularly adapted to heemployed as he dust can for a usual valve stein of a 'ine inventionvvill be readily understood 'from the following description of the ac*-companying drawings, in which:

Figure l is a side elevation of cap constructed in accordance with theinvention.

2 is an enlarged vertical section li the saine mouir d upon a nipple.llig. 23 a side elevation of the nipple upon which the cap mounted;

lis a transverse section on the line l-aor li'ig. 2.

lfig. isv a longitudinal section 'through the valve stein oi' a tirehaving a dust cap constructed in accordance with the invention, mountedthereon. i

Fig. 6 is a transverse section on the line 6--6 or' Fig. y

In the i'orrn oi the invention illustrated in Figs. l to e, I have shownthe improved cap as arranged to he received upon a n ipple l, having thehase flange 2 terminating in the threaded projection 3 by means of whichthe nipple is mounted in position.

` rllhe improved cap comprises a cylindrical member l having theenlarged end plate 5 lor closing one end of the saine, and prete "z lilylformed oi such size and material as to maintain its shape at all times.`The open end of the cap is provided with an enlarged annular liange 6,which is also of such size and material as to maintain a concentricannular' shape. T he cap as thus constructed, is adapted to be slippedover nipple l, and a packing T of cork or the like, is preferablyprovided Within the head ofthe cap, so as 'to "oe received against 4theend of the nipple in order to provide a tight joint.

The material forming the body l of the cap is, preferably, of somewhatresilient metal, and opposite sides of said body portion oi" the cap areprovided With elongated flattened portions 8, which in transverseseetion are closer to one another than the concentric portions of thecircumference of the cap, as clearly shown in Fig. 4l. The cap isarranged to fit relatively snugly over nipple l, and as a consequence7`the flattened portions 8 of the cap Will frictionally hear against thenipple ior retaining the cap iu position when placed over the nipple.The :'ri'ctional engagement thus provided will 4hold the cap againstdisplacement under ordinary circumstances, hut at the same time the capmay he readily removed by pulling upon the saine with sulicient force.

lin the form oi the invention illustrated in Figs. E and 6, l have showna usual valve stem l for a. pneumatic tire having the usuallongitudinally extending flattened sides il) and usual 'threads ilprovided upon the stein. rElie dust cap for this stem isconstructedsimilar tothe cap previously de scribed, including the maincap portion il, eud plate 5a und base flange 6, The sides of the cap areflattened longitudinally or" the same, as shovvn at 8, so that said dattened sides will he received against the flattened surfaces i0 of thevalve stem when the dust .cap is placed upon the valve stem forrictionally holding the cap to the stem.

It will thus be seen that I have provided an extremely simple means forretaining a cap upon a nipple or the like, by simply flattening oppositesides of the cap suliciently to cause rietional engagement hetWeen thecap and nipple. The cap is thus held in position against displacementunder normal conditions, but may be quickly Withdrawn 'from the nipplehv pulling upon the same.

Various changes may he made Without departing :trom the spirit of theinvention as claimed.

lillhat is claimed is l. T he combination with a concentric nipvple of acap formed of resilient metal received over the saine andhavingi'lattencd sides intermediate its ends for irictional engagementwith said nipple.

2. A cap comprising a cylindrical body adaptedfto be expanded onapplication of portion having flattened opposite sides and the cap to anipple for frictionally retaining formed of slightly resilient material,and a the Cap uponv the "nipple when saidfcap is 10 closure plate and aflange at the respective placed over the nipple in an axial direction.

5 ends 0f said capforstiifening the same. In testimonywliereof l, havesigned my 3. A. cap comprising a body formed of name to thisspecification. v Y Y resilient metal having a 'restricted portion gWlLLIAM CARL IFTIGER.

